Axial force balance structure of boost air flotation turbine cooler

Abstract

The invention belongs to the technical field of aviation turbine coolers, and relates to axial force balance of a pod environmentally controlled turbine cooler, in particular to an axial force balancestructure of a pod environmentally controlled boost air flotation turbine cooler. The structure is composed of a compressor volute, a compressor impeller, a shaft, a dynamic sealing ring, a self-locking nut and a pull rod. The compressor impeller is pressed into a hole of the shaft, the pull rod penetrates through the shaft and the compressor impeller, the dynamic sealing ring is arranged on a shaft head of the compressor impeller, and the self-locking nut is installed on the pull rod and compresses the dynamic sealing ring; the compressor volute is fixed to a housing through screws; a diversion device is arranged at an inlet of the compressor volute, a hole is formed in the middle of the diversion device to form a seal with the dynamic sealing ring, and the compressor volute and the dynamic sealing ring form a cavity A. A novel structure floating device greatly reduces or even eliminates the axial force and additional friction torque during the rotor starting process, the floating problem of a boost air flotation turbine is fundamentally solved, and compared with a general structure, the novel structure has great advantages.

Description

technical field [0001] The invention belongs to the technical field of aviation turbine coolers, and relates to axial force balance of a turbine cooler, in particular to an axial force balance structure of a pressurized air flotation turbine cooler. Background technique [0002] The air bearings of aviation turbine coolers use air as the lubricating medium, do not require external bleed air, have no oil pollution, no contact friction, high speed, long life, and high reliability, and are widely used to replace ball bearings. The structure of the current boosted air-floating turbo-compressor can be found in figure 1 , which consists of compressor volute, compressor impeller, shaft, washer, self-locking nut and tie rod. The compressor impeller is pressed into the shaft hole, the pull rod passes through the shaft and the compressor impeller, the self-locking nut is installed on the pull rod, and the washer is pressed; the compressor volute is fixed on the casing by screws. Whe...

AI Technical Summary

Problems solved by technology

When the rotor is stationary, the air-bearing rotor is tightly wrapped by the elastic foil of the bearing, which generates additional friction for the rotor to start. In addition, because the air flow from the compressor inlet to the turbine outlet is a throttling process, the pressure gradually decreases to atmospheric pressure. This results in a pressure differential between the compressor inlet and the turbine outlet ( figure 2 ), the pressure difference produces an axial force P1 directed from the compressor to the turbine (see figure 1 ), which is not conducive to the starting of the rotor. At the same time, it also accelerates the wear of the bearing and shortens the service life of the bearing

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